Energie

$$\begin{array}{rlr}E& ={\int }_{\mathrm{J}}p(t)dt& ={\int }_{\mathrm{J}}|x(t){|}^{2}dt\\ E& =\sum _{n\in \mathrm{J}}p[n]& =\sum _{n\in \mathrm{J}}|x[n]{|}^2\end{array}$$

$E_{\infty }\dots$ energie $\mathrm{J}=(-\infty ,\infty )$ - Celková energie signálu